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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Compilation using std::map fails with gcc's STL 6.2.0."
href="https://llvm.org/bugs/show_bug.cgi?id=30519">30519</a>
</td>
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<tr>
<th>Summary</th>
<td>Compilation using std::map fails with gcc's STL 6.2.0.
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.6
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ruben.lapauw@cs.kuleuven.be
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=17345" name="attach_17345" title="Minimal unworking example">attachment 17345</a> <a href="attachment.cgi?id=17345&action=edit" title="Minimal unworking example">[details]</a></span>
Minimal unworking example
The error occurs for clang versions (tested 3.6.1 and 3.8.1) with the
gcc-toolchain (6.2.0) only when C++11 is enabled.
With gcc-toolchain version 5.4.0 or 4.8.5 the error does not occur.
Without C++11 the error does not occur, yet there is no C++11 specific header
code (that I can see).
With gcc of any version (4.8.5, 5.4.0, 6.2.0) the error does not occur.
I ran the attached file with the following commands:
clang++ --std=c++11 -c test.cpp
clang++ -c test.cpp
g++ --std=c++11 -c test.cpp
g++ -c test.cpp
The difference can be traced back to changes to the following lines:
620 // Shortcut for the cases where constructors taking _UElements...
621 // need to be constrained.
622 template<typename... _UElements> using _TMC =
623 _TC<(sizeof...(_Elements) == sizeof...(_UElements)),
624 _Elements...>;
625
626 template<typename... _UElements, typename
627 enable_if<
x 628 _TC<sizeof...(_UElements) == 1,
_Elements...>::template
x 629 _NotSameTuple<_UElements...>()
x 630 && _TMC<_UElements...>::template
x 631 _MoveConstructibleTuple<_UElements...>()
x 632 && _TMC<_UElements...>::template
x 633 _ImplicitlyMoveConvertibleTuple<_UElements...>()
x 634 && (sizeof...(_Elements) >= 1),
x 635 bool>::type=true>
636 constexpr tuple(_UElements&&... __elements)
637 : _Inherited(std::forward<_UElements>(__elements)...) { }
638
639 template<typename... _UElements, typename
640 enable_if<
x 641 _TC<sizeof...(_UElements) == 1,
_Elements...>::template
x 642 _NotSameTuple<_UElements...>()
x 643 && _TMC<_UElements...>::template
x 644 _MoveConstructibleTuple<_UElements...>()
x 645 && !_TMC<_UElements...>::template
x 646 _ImplicitlyMoveConvertibleTuple<_UElements...>()
x 647 && (sizeof...(_Elements) >= 1),
x 648 bool>::type=false>
649 explicit constexpr tuple(_UElements&&... __elements)
650 : _Inherited(std::forward<_UElements>(__elements)...) { }</pre>
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